Switched from using YUI Compressor to Google Compiler. Minified and Gzipped filesize reduced to 22,839 bytes from 26,169 bytes (13% decrease in filesize). Sizzle copyright was merged into the main header (since it's removed automatically). Still passes all unit tests.

Disabled the passthrough .attr(method_name) functionality. You can now use it if you do: .attr({method_name: value}, true) OR as an easy initialization method: jQuery('<div/>', {html: '...', id: 'test'}).

Revert the changes from 65ebf57c1e5d7fa96536b66d4fcacbafad8dc1e5, they were ineffectual against IE's insanity: http://ejohn.org/files/bugs/fragment/ Used a different tactic instead (just don't return a fragment from .parent()). Fixes #5638.